Simple Doorbell Wiring Diagram
The following link provides you detailed information on how to design a simple doorbell for home application. The doorbell wiring diagram consists of: AC power input, doorbell transformer, bypass switch, solid state relay, doorbell button, ATtiny12 timer, capacitor, and a 5 watt power supply. The ATtiny11/12 is a low-power CMOS 8-bit microcontroller designed and produced by ATMEL semiconductor.
Find more information regarding the design of simple doorbell wiring diagram here (source: cappels.org)